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NTIS

01/01/1988

Collation

xi, 230 p. : ill. ; 28 cm.

Abstract

Air quality data observed aboard a manned balloon is reported and analyzed, together with concurrent data from the St. Louis RAMS monitoring network, and from a mobile van which was driven beneath the track of the balloon. The study was conducted on June 8-9, 1976, near and downwind of St. Louis, Missouri, during a period of atmospheric stagnation. During daylight hours, ozone levels measured aboard the balloon and at a ground level were similar. At night, ozone trapped aloft by a nocturnal inversion remains stable, whereas ozone observed at ground level decays rapidly. Transport of ozone overnight, for distances of at least 180 km, is documented. With the weak synoptic flow conditions prevailing on June 8, a daytime heat island effect is documented. Maximum ozone concentrations were observed at a location where this complex flow field converges.